Hacks, Kludges & Other Such Tomfoolery

[JBookup]

Okay last string I posted is "whatupplaya". This is an somewhat more complicated string unfortunately I did not incorporate Faust's idea of reversing and counting differences. Its straightforward no rearranging needed, only mathematical ingenuity. And if you figure out the math you might have to guess around a little bit as to what your final numbers correspond to. In the end you are gonna have 4 numbers that correspond to 4 letters of the alphabet in numerical and alphabetical order but not 1-26. This is a 4 letter word please try to solve.

78642008877532165994187424169990

[axod]

Fresh take on old communication hack: 
Altoid Box Laser FM transmission - (upgraydable)
https://youtube.com/watch?v=pvj3KDp8Ae8